51520224 has 48 divisors (see below), whose sum is σ = 154562688. Its totient is φ = 14719872.

The previous prime is 51520219. The next prime is 51520247. The reversal of 51520224 is 42202515.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 51520224.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37662 + ... + 39005.

It is an arithmetic number, because the mean of its divisors is an integer number (3220056).

Almost surely, 2^51520224 is an apocalyptic number.

It is an amenable number.

51520224 is an abundant number, since it is smaller than the sum of its proper divisors (103042464).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51520224 is a wasteful number, since it uses less digits than its factorization.

51520224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76687 (or 76679 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 51520224 is about 7177.7589817435. The cubic root of 51520224 is about 372.0996380113.

Adding to 51520224 its reverse (42202515), we get a palindrome (93722739).

The spelling of 51520224 in words is "fifty-one million, five hundred twenty thousand, two hundred twenty-four".